Floor slab



July 31, 1923.

FLOOR SLAB Filed Nov. 16

Patented July 3l, 1923,

FLOOR SLAB.

Application led November 16, 1921. Serial No. 515,452.

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Be it known that we, FRED LICHTENBERG and Miei-Linn M. MCCARTHY, citizens of the United States, and residents of Yonkers, 1Westchester County, and State of New York, have invented certain new and useful lmprovements in Floor Slabs, of which the following is a specification.

Our present invention relates particularly to floor structures.

The objects of the invention are to provide a slab construction for flooring or other purposes which will be automatically interlocked and keyed together as the structure is built up and which will hold the keying or bonding material without the necessity of any special forms.

rFriese and other advantageous results are attained in our invention by means of certain novel features of construction, combination and relation of parts, a typical eX- ample of which is given in the accompanying drawing forming part of this specification.

In the drawing referred to, Figure 1 is a cross sectional view of one of our building slabs and the adjoining portion of another, illustrating the manner in which the interlock and bonding between the slabs is effected.

Figure 2 is a broken plan view of a single slab.

Figure 3 is a broken plan view of a floor made up of these slabs.

The slabs, which are designated 5, are constructed of concrete or other suitable cementitious material, of a size and shape to suit any usual or special requirements. They also are preferably suitably reinforced. In the illustration this reinforcement is effected by providing a double layer of reinforcing rods or wires, located one layer adjacent each face of the slab. The rods of the two series are designated 6 and 7 respectively, and are shown as spaced equal distances apart but arranged with the rods in one layer diagonally offset from the rods in the opposite layer. The rods are held in this spaced relation by suitable connecting tie wires 8 and the rods of the two layers are tied together by diagonally extending tie elements 9 which may be formed by lacing wir-es diagonally back and forth between the rods of the two layers.

A special feature of the reinforcing` rods 6 in the uppermost layer in Figures 1 and 2 is that the outer rods are supported by the positioning wires 8 offset in spaced relation at the edges of the slabso as to operate as ties between adjoining slabs and form rein'- forcements for the'bonding material used between the adjoining slabs.

The bonding of the adjoining slabs Tis aecomplished in our invention by providing the slabs along theirlongitudinal edges and adjacent one faceof the slabswith recesses 10 which form, when the lower corner edges of the'slabs are brought togetherintoabutting relation, closed troughs for the reception of keys of bonding material at 11, Figure 1. These recesses are preferably undercut as shown in Figure 1, so as to interlock the bonding material therein and prevent the bonding keys from working loose upon contraction.

It will be noted that the outstanding reinforcements above described are located at the upper corner edges of the slab and so are disposed within the troughs formed when adjacent slabs are brought into abutting engagement. Also in the illustration the exposed reinforcements, including the tie wires 8, extend far enough to project practically entirely across these troughs, and hence that when the slabs are brought together, such reinforcements will stand in overlapping relation. This construction, therefore, ties and bonds the slabs together in very secure fashion and reinforces the bonding key so that this key becomes of practically the same strength as the slab itself.

If further reinforcement of the bonds is desired, reinforcing elements such as the rods 12 may be laid looselyin the troughs either upon or beneath the overlapped reinforcements described. These added reinforcements, as shown in Figure 3 may be extended the full length of the floor and hence operate to tie the slabs together in their end-to-end relation, as well as form full length reinforcements for the floor.

By way of example, we have shown in Figure 3 how in the case of building a floor, the slabs lmay be supported directly on I-beams 13 with their longitudinal edges in abutting relation to provide the closed troughs for the bonding material andhow the bonding material forming these keys may be a part of the final flooring itself.

This means that when the slabs are properly laid the flooring material may be flowed directly thereover, as indicated treten particularly at 14' in Figure 3, said material working into the closed troughs about the reinforcements and acting as` it hardens both to bond the slabs together and to serve as the floor surface.

VVha-t vve claim is- 1. 'Flooring slabs of cernentitious material recessed along their upper edges to pro` vide when the slabs are assembled with their lower edges in ,abutting engagement, troughs open at the top to receive plastic bonding material, layers of reinforcement near the upper and lower faces of the slabs, said layers being connected in spaced relation by ties, the lower reinforcement layers including reinforcement rods extending along the lower projecting abutting edges of the slabs and the upperreinforcing layers having extensions projecting past; the re.-

cessed upper` edges of the slabs, beyond the lower projecting edges thereof and across the troughs provided between adjoining slabs to thereby form a substantially continuous reinforcement and bond between the slabs.

2. The structure of claim 1 in which the reinforcing extensions which project beyond the recessed upper edges of the slabs carry longitudinally extending reinforcing rods standing free of the slabs by which they are carried and adapted Ifor cooperative relation with the adjoining slabs.

In witness whereof, we have hereunto set our hands, this 3rd day of November, 1921.

FRED LICHTENBERG. MICHAEL M. MCCARTHY. 

